﻿// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors

// Based on Lightscreen areadialog.cpp, Copyright 2017  Christian Kaiser
// <info@ckaiser.com.ar> released under the GNU GPL2
// <https://www.gnu.org/licenses/gpl-2.0.txt>

// Based on KDE's KSnapshot regiongrabber.cpp, revision 796531, Copyright 2007
// Luca Gugelmann <lucag@student.ethz.ch> released under the GNU LGPL
// <http://www.gnu.org/licenses/old-licenses/library.txt>

#include "capturewidget.h"
#include "src/core/controller.h"
#include "src/core/qguiappcurrentscreen.h"
#include "src/tools/toolfactory.h"
#include "src/utils/colorutils.h"
#include "src/utils/screengrabber.h"
#include "src/utils/screenshotsaver.h"
#include "src/utils/systemnotification.h"
#include "src/widgets/capture/colorpicker.h"
#include "src/widgets/capture/hovereventfilter.h"
#include "src/widgets/capture/modificationcommand.h"
#include "src/widgets/capture/notifierbox.h"
#include "src/widgets/orientablepushbutton.h"
#include "src/widgets/panel/sidepanelwidget.h"
#include "src/widgets/updatenotificationwidget.h"
#include <QApplication>
#include <QDateTime>
#include <QDesktopWidget>
#include <QPaintEvent>
#include <QPainter>
#include <QScreen>
#include <QShortcut>
#include <QUndoView>
#include <draggablewidgetmaker.h>

#define SPDLOG_ACTIVE_LEVEL SPDLOG_LEVEL_DEBUG
#include "spdlog/spdlog.h"

// CaptureWidget is the main component used to capture the screen. It contains
// an area of selection with its respective buttons.

// enableSaveWIndow
CaptureWidget::CaptureWidget(const uint id,
                             const QString& savePath,
                             bool fullScreen,
                             QWidget* parent)
  : QWidget(parent)
  , m_mouseIsClicked(false)
  , m_rightClick(false)
  , m_newSelection(false)
  , m_grabbing(false)
  , m_captureDone(false)
  , m_previewEnabled(true)
  , m_adjustmentButtonPressed(false)
  , m_activeButton(nullptr)
  , m_activeTool(nullptr)
  , m_toolWidget(nullptr)
  , m_mouseOverHandle(SelectionWidget::NO_SIDE)
  , m_id(id)
  , m_lastMouseWheel(0)
  , m_updateNotificationWidget(nullptr)
{
    // Base config of the widget
    m_eventFilter = new HoverEventFilter(this);
    connect(m_eventFilter,
            &HoverEventFilter::hoverIn,
            this,
            &CaptureWidget::childEnter);
    connect(m_eventFilter,
            &HoverEventFilter::hoverOut,
            this,
            &CaptureWidget::childLeave);
    setAttribute(Qt::WA_DeleteOnClose);
    m_showInitialMsg = m_config.showHelpValue();
    m_opacity = m_config.contrastOpacityValue();
    setMouseTracking(true);
    initContext(savePath, fullScreen);
    initShortcuts();
    m_context.circleCount = 1;
#if (defined(Q_OS_WIN) || defined(Q_OS_MACOS))
    // Top left of the whole set of screens
    QPoint topLeft(0, 0);
#endif
    if (fullScreen) {
        // Grab Screenshot
        bool ok = true;
        m_context.screenshot = ScreenGrabber().grabEntireDesktop(ok);
        if (!ok) {
            SystemNotification().sendMessage(tr("Unable to capture screen"));
            this->close();
        }
        m_context.origScreenshot = m_context.screenshot;

#if defined(Q_OS_WIN)
        setWindowFlags(Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint |
                       Qt::Popup);

        for (QScreen* const screen : QGuiApplication::screens()) {
            QPoint topLeftScreen = screen->geometry().topLeft();

            if (topLeftScreen.x() < topLeft.x()) {
                topLeft.setX(topLeftScreen.x());
            }
            if (topLeftScreen.y() < topLeft.y()) {
                topLeft.setY(topLeftScreen.y());
            }
        }
        move(topLeft);
        resize(pixmap().size());
#elif defined(Q_OS_MACOS)
        // Emulate fullscreen mode
        //        setWindowFlags(Qt::WindowStaysOnTopHint |
        //        Qt::BypassWindowManagerHint |
        //                       Qt::FramelessWindowHint |
        //                       Qt::NoDropShadowWindowHint | Qt::ToolTip |
        //                       Qt::Popup
        //                       );
        QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
        move(currentScreen->geometry().x(), currentScreen->geometry().y());
        resize(currentScreen->size());
#else
        setWindowFlags(Qt::BypassWindowManagerHint | Qt::WindowStaysOnTopHint |
                       Qt::FramelessWindowHint | Qt::Tool);
        resize(pixmap().size());
#endif
    }
    // Create buttons
    m_buttonHandler = new ButtonHandler(this);
    updateButtons();
    QVector<QRect> areas;
    if (m_context.fullscreen) {
        QPoint topLeftOffset = QPoint(0, 0);
#if defined(Q_OS_WIN)
        topLeftOffset = topLeft;
#endif

#if defined(Q_OS_MACOS)
        // MacOS works just with one active display, so we need to append
        // just one current display and keep multiple displays logic for
        // other OS
        QRect r;
        QScreen* screen = QGuiAppCurrentScreen().currentScreen();
        r = screen->geometry();
        // all calculations are processed according to (0, 0) start
        // point so we need to move current object to (0, 0)
        r.moveTo(0, 0);
        areas.append(r);
#else
        for (QScreen* const screen : QGuiApplication::screens()) {
            QRect r = screen->geometry();
            r.moveTo(r.x() / screen->devicePixelRatio(),
                     r.y() / screen->devicePixelRatio());
            r.moveTo(r.topLeft() - topLeftOffset);
            areas.append(r);
        }
#endif
    } else {
        areas.append(rect());
    }
    m_buttonHandler->updateScreenRegions(areas);
    m_buttonHandler->hide();

    initSelection();
    updateCursor();

    // Init color picker
    m_colorPicker = new ColorPicker(this);
    connect(m_colorPicker,
            &ColorPicker::colorSelected,
            this,
            &CaptureWidget::setDrawColor);
    m_colorPicker->hide();

    // Init notification widget
    m_notifierBox = new NotifierBox(this);
    m_notifierBox->hide();

    connect(&m_undoStack, &QUndoStack::indexChanged, this, [this](int) {
        this->update();
    });
    initPanel();
}

CaptureWidget::~CaptureWidget()
{
    if (m_captureDone) {
        emit captureTaken(m_id, this->pixmap(), m_context.selection);
    } else {
        emit captureFailed(m_id);
    }
    m_config.setDrawThickness(m_context.thickness);
}

// redefineButtons retrieves the buttons configured to be shown with the
// selection in the capture
void CaptureWidget::updateButtons()
{
    m_uiColor = m_config.uiMainColorValue();
    m_contrastUiColor = m_config.uiContrastColorValue();

    auto buttons = m_config.getButtons();
    QVector<CaptureToolButton*> vectorButtons;

    for (const CaptureToolButton::ButtonType& t : buttons) {
        CaptureToolButton* b = new CaptureToolButton(t, this);
        if (t == CaptureToolButton::TYPE_SELECTIONINDICATOR) {
            m_sizeIndButton = b;
        }
        b->setColor(m_uiColor);
        makeChild(b);

        switch (t) {
            case CaptureToolButton::ButtonType::TYPE_EXIT:
            case CaptureToolButton::ButtonType::TYPE_SAVE:
            case CaptureToolButton::ButtonType::TYPE_COPY:
            case CaptureToolButton::ButtonType::TYPE_UNDO:
            case CaptureToolButton::ButtonType::TYPE_REDO:
                // nothing to do, just skip non-dynamic buttons with existing
                // hard coded slots
                break;
            default:
                // Set shortcuts for a tool
                QString shortcut =
                  ConfigHandler().shortcut(QVariant::fromValue(t).toString());
                if (!shortcut.isNull()) {
                    QShortcut* key =
                      new QShortcut(QKeySequence(shortcut), this);
                    CaptureWidget* captureWidget = this;
                    connect(key, &QShortcut::activated, this, [=]() {
                        emit captureWidget->setState(b);
                    });
                }
                break;
        }

        connect(
          b, &CaptureToolButton::pressedButton, this, &CaptureWidget::setState);
        connect(b->tool(),
                &CaptureTool::requestAction,
                this,
                &CaptureWidget::handleButtonSignal);

        vectorButtons << b;
    }
    m_buttonHandler->setButtons(vectorButtons);
}

QPixmap CaptureWidget::pixmap()
{
    QPixmap p;
    if (m_toolWidget && m_activeTool) {
        p = m_context.selectedScreenshotArea().copy();
        QPainter painter(&p);
        m_activeTool->process(painter, p);
    } else {
        p = m_context.selectedScreenshotArea();
    }
    return m_context.selectedScreenshotArea();
}

// Finish whatever the current tool is doing, if there is a current active
// tool.
bool CaptureWidget::commitCurrentTool()
{
    if (m_activeButton) {
        if (m_activeTool) {
            if (m_activeTool->isValid() && m_toolWidget) {
                pushToolToStack();
            } else {
                m_activeTool->deleteLater();
            }
            if (m_toolWidget) {
                m_toolWidget->deleteLater();
                return true;
            }
        }
    }
    return false;
}

void CaptureWidget::deleteToolwidgetOrClose()
{
    if (m_panel->isVisible()) {
        m_panel->hide();
    } else if (m_toolWidget) {
        m_toolWidget->deleteLater();
        m_toolWidget = nullptr;
    } else {
        close();
    }
}

void CaptureWidget::paintEvent(QPaintEvent*)
{
    QPainter painter(this);
    painter.drawPixmap(0, 0, m_context.screenshot);

    if (m_activeTool && m_mouseIsClicked) {
        painter.save();
        m_activeTool->process(painter, m_context.screenshot);
        painter.restore();
    } else if (m_activeButton && m_activeButton->tool()->showMousePreview() &&
               m_previewEnabled) {
        painter.save();
        m_activeButton->tool()->paintMousePreview(painter, m_context);
        painter.restore();
    }

    QColor overlayColor(0, 0, 0, m_opacity);
    painter.setBrush(overlayColor);
    QRect r;
    if (m_selection->isVisible()) {
        r = m_selection->geometry().normalized().adjusted(0, 0, -1, -1);
    }
    QRegion grey(rect());
    grey = grey.subtracted(r);

    painter.setClipRegion(grey);
    painter.drawRect(-1, -1, rect().width() + 1, rect().height() + 1);
    painter.setClipRect(rect());

    if (m_showInitialMsg) {
#if defined(Q_OS_MACOS)
        QRect helpRect;
        QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
        if (currentScreen) {
            helpRect = currentScreen->geometry();
        } else {
            helpRect = QGuiApplication::primaryScreen()->geometry();
        }
#else
        QRect helpRect = QGuiApplication::primaryScreen()->geometry();
#endif

        helpRect.moveTo(mapFromGlobal(helpRect.topLeft()));

        QString helpTxt =
          tr("Select an area with the mouse, or press Esc to exit."
             "\nPress Enter to capture the screen."
             "\nPress Right Click to show the color picker."
             "\nUse the Mouse Wheel to change the thickness of your tool."
             "\nPress Space to open the side panel.");

        // We draw the white contrasting background for the text, using the
        // same text and options to get the boundingRect that the text will
        // have.
        QRectF bRect = painter.boundingRect(helpRect, Qt::AlignCenter, helpTxt);

        // These four calls provide padding for the rect
        const int margin = QApplication::fontMetrics().height() / 2;
        bRect.setWidth(bRect.width() + margin);
        bRect.setHeight(bRect.height() + margin);
        bRect.setX(bRect.x() - margin);
        bRect.setY(bRect.y() - margin);

        QColor rectColor(m_uiColor);
        rectColor.setAlpha(180);
        QColor textColor(
          (ColorUtils::colorIsDark(rectColor) ? Qt::white : Qt::black));

        painter.setBrush(QBrush(rectColor, Qt::SolidPattern));
        painter.setPen(QPen(textColor));

        painter.drawRect(bRect);
        painter.drawText(helpRect, Qt::AlignCenter, helpTxt);
    }

    if (m_selection->isVisible()) {
        // paint handlers
        painter.setPen(m_uiColor);
        painter.setRenderHint(QPainter::Antialiasing);
        painter.setBrush(m_uiColor);
        for (auto r : m_selection->handlerAreas()) {
            painter.drawRoundedRect(r, 100, 100);
        }
    }
}

void CaptureWidget::mousePressEvent(QMouseEvent* e)
{
    if (e->button() == Qt::RightButton) {
        m_rightClick = true;
        m_colorPicker->move(e->pos().x() - m_colorPicker->width() / 2,
                            e->pos().y() - m_colorPicker->height() / 2);
        m_colorPicker->raise();
        m_colorPicker->show();
    } else if (e->button() == Qt::LeftButton) {
        m_showInitialMsg = false;
        m_mouseIsClicked = true;
        // Click using a tool
        if (m_activeButton) {
            if (commitCurrentTool()) {
                return;
            }
            m_activeTool = m_activeButton->tool()->copy(this);

            connect(this,
                    &CaptureWidget::colorChanged,
                    m_activeTool,
                    &CaptureTool::colorChanged);
            connect(this,
                    &CaptureWidget::thicknessChanged,
                    m_activeTool,
                    &CaptureTool::thicknessChanged);
            connect(m_activeTool,
                    &CaptureTool::requestAction,
                    this,
                    &CaptureWidget::handleButtonSignal);
            m_context.mousePos = e->pos();
            m_activeTool->drawStart(m_context);
            return;
        }

        m_dragStartPoint = e->pos();
        m_selection->saveGeometry();
        // New selection
        if (!m_selection->geometry().contains(e->pos()) &&
            m_mouseOverHandle == SelectionWidget::NO_SIDE) {
            m_selection->setGeometry(QRect(e->pos(), e->pos()));
            m_selection->setVisible(false);
            m_newSelection = true;
            m_buttonHandler->hide();
            update();
        } else {
            m_grabbing = true;
        }
    }
    updateCursor();
}

void CaptureWidget::mouseMoveEvent(QMouseEvent* e)
{
    m_context.mousePos = e->pos();
    bool symmetryMod = qApp->keyboardModifiers() & Qt::ShiftModifier;

    if (m_mouseIsClicked && !m_activeButton) {
        // Drawing, moving, or stretching a selection
        m_selection->setVisible(true);
        if (m_buttonHandler->isVisible()) {
            m_buttonHandler->hide();
        }
        QRect inputRect;
        if (m_newSelection) {
            // Drawing a new selection
            inputRect = symmetryMod
                          ? QRect(m_dragStartPoint * 2 - m_context.mousePos,
                                  m_context.mousePos)
                          : QRect(m_dragStartPoint, m_context.mousePos);

        } else if (m_mouseOverHandle == SelectionWidget::NO_SIDE) {
            // Moving the whole selection
            QRect initialRect = m_selection->savedGeometry().normalized();
            QPoint newTopLeft =
              initialRect.topLeft() + (e->pos() - m_dragStartPoint);
            inputRect = QRect(newTopLeft, initialRect.size());
        } else {
            // Dragging a handle
            inputRect = m_selection->savedGeometry();
            QPoint offset = e->pos() - m_dragStartPoint;

            using sw = SelectionWidget;
            QRect& r = inputRect;
            if (m_mouseOverHandle == sw::TOPLEFT_SIDE ||
                m_mouseOverHandle == sw::TOP_SIDE ||
                m_mouseOverHandle == sw::TOPRIGHT_SIDE) {
                // dragging one of the top handles
                r.setTop(r.top() + offset.y());
                if (symmetryMod) {
                    r.setBottom(r.bottom() - offset.y());
                }
            }
            if (m_mouseOverHandle == sw::TOPLEFT_SIDE ||
                m_mouseOverHandle == sw::LEFT_SIDE ||
                m_mouseOverHandle == sw::BOTTOMLEFT_SIDE) {
                // dragging one of the left handles
                r.setLeft(r.left() + offset.x());
                if (symmetryMod) {
                    r.setRight(r.right() - offset.x());
                }
            }
            if (m_mouseOverHandle == sw::BOTTOMLEFT_SIDE ||
                m_mouseOverHandle == sw::BOTTOM_SIDE ||
                m_mouseOverHandle == sw::BOTTOMRIGHT_SIDE) {
                // dragging one of the bottom handles
                r.setBottom(r.bottom() + offset.y());
                if (symmetryMod) {
                    r.setTop(r.top() - offset.y());
                }
            }
            if (m_mouseOverHandle == sw::TOPRIGHT_SIDE ||
                m_mouseOverHandle == sw::RIGHT_SIDE ||
                m_mouseOverHandle == sw::BOTTOMRIGHT_SIDE) {
                // dragging one of the right handles
                r.setRight(r.right() + offset.x());
                if (symmetryMod) {
                    r.setLeft(r.left() - offset.x());
                }
            }
        }
        m_selection->setGeometry(inputRect.intersected(rect()).normalized());
        update();
    } else if (m_mouseIsClicked && m_activeTool) {
        // drawing with a tool
        if (m_adjustmentButtonPressed) {
            m_activeTool->drawMoveWithAdjustment(e->pos());
        } else {
            m_activeTool->drawMove(e->pos());
        }
        update();
        // Hides the buttons under the mouse. If the mouse leaves, it shows
        // them.
        if (m_buttonHandler->buttonsAreInside()) {
            const bool containsMouse =
              m_buttonHandler->contains(m_context.mousePos);
            if (containsMouse) {
                m_buttonHandler->hide();
            } else {
                m_buttonHandler->show();
            }
        }
    } else if (m_activeButton && m_activeButton->tool()->showMousePreview()) {
        update();
    } else {
        if (!m_selection->isVisible()) {
            return;
        }
        m_mouseOverHandle = m_selection->getMouseSide(m_context.mousePos);
        updateCursor();
    }
}

void CaptureWidget::mouseReleaseEvent(QMouseEvent* e)
{
    if (e->button() == Qt::RightButton || m_colorPicker->isVisible()) {
        m_colorPicker->hide();
        m_rightClick = false;
        if (!m_context.color.isValid()) {
            m_context.color = ConfigHandler().drawColorValue();
            m_panel->show();
        }
        // when we end the drawing we have to register the last  point and
        // add the temp modification to the list of modifications
    } else if (m_mouseIsClicked && m_activeTool) {
        m_activeTool->drawEnd(m_context.mousePos);
        if (m_activeTool->isValid()) {
            pushToolToStack();
        } else if (!m_toolWidget) {
            m_activeTool->deleteLater();
            m_activeTool = nullptr;
        }
    }

    // Show the buttons after the resize of the selection or the creation
    // of a new one.
    if (!m_buttonHandler->isVisible() && m_selection->isVisible()) {
        // Don't go outside
        QRect newGeometry = m_selection->geometry().intersected(rect());
        // normalize
        if (newGeometry.width() <= 0) {
            int left = newGeometry.left();
            newGeometry.setLeft(newGeometry.right());
            newGeometry.setRight(left);
        }
        if (newGeometry.height() <= 0) {
            int top = newGeometry.top();
            newGeometry.setTop(newGeometry.bottom());
            newGeometry.setBottom(top);
        }
        m_selection->setGeometry(newGeometry);
        m_context.selection = extendedRect(&newGeometry);
        updateSizeIndicator();
        m_buttonHandler->updatePosition(newGeometry);
        m_buttonHandler->show();
    }
    m_mouseIsClicked = false;
    m_newSelection = false;
    m_grabbing = false;

    updateCursor();
}

void CaptureWidget::moveSelection(QPoint p)
{
    adjustSelection(QMargins(-p.x(), -p.y(), p.x(), p.y()));
}

void CaptureWidget::moveLeft()
{
    moveSelection(QPoint(-1, 0));
}

void CaptureWidget::moveRight()
{
    moveSelection(QPoint(1, 0));
}

void CaptureWidget::moveUp()
{
    moveSelection(QPoint(0, -1));
}

void CaptureWidget::moveDown()
{
    moveSelection(QPoint(0, 1));
}

void CaptureWidget::keyPressEvent(QKeyEvent* e)
{
    if (!m_selection->isVisible()) {
        return;
    } else if (e->key() == Qt::Key_Control) {
        m_adjustmentButtonPressed = true;
    } else if (e->key() == Qt::Key_Enter) {
        // Make no difference for Return and Enter keys
        QKeyEvent* keyReturn =
          new QKeyEvent(QEvent::KeyPress, Qt::Key_Return, Qt::NoModifier);
        QCoreApplication::postEvent(this, keyReturn);
    }
}

void CaptureWidget::keyReleaseEvent(QKeyEvent* e)
{
    if (e->key() == Qt::Key_Control) {
        m_adjustmentButtonPressed = false;
    }
}

void CaptureWidget::wheelEvent(QWheelEvent* e)
{
    /* Mouse scroll usually gives value 120, not more or less, just how many
     * times.
     * Touchpad gives the value 2 or more (usually 2-8), it doesn't give
     * too big values like mouse wheel on normal scrolling, so it is almost
     * impossible to scroll. It's easier to calculate number of requests and do
     * not accept events faster that one in 200ms.
     * */
    int thicknessOffset = 0;
    if (e->angleDelta().y() >= 60) {
        // mouse scroll (wheel) increment
        thicknessOffset = 1;
    } else if (e->angleDelta().y() <= -60) {
        // mouse scroll (wheel) decrement
        thicknessOffset = -1;
    } else {
        // touchpad scroll
        qint64 current = QDateTime::currentMSecsSinceEpoch();
        if ((current - m_lastMouseWheel) > 200) {
            if (e->angleDelta().y() > 0) {
                thicknessOffset = 1;
            } else if (e->angleDelta().y() < 0) {
                thicknessOffset = -1;
            }
            m_lastMouseWheel = current;
        } else {
            return;
        }
    }

    m_context.thickness += thicknessOffset;
    m_context.thickness = qBound(0, m_context.thickness, 100);
    QPoint topLeft =
      QGuiAppCurrentScreen().currentScreen()->geometry().topLeft();
    int offset = m_notifierBox->width() / 4;
    m_notifierBox->move(mapFromGlobal(topLeft) + QPoint(offset, offset));
    m_notifierBox->showMessage(QString::number(m_context.thickness));
    if (m_activeButton && m_activeButton->tool()->showMousePreview()) {
        update();
    }
    emit thicknessChanged(m_context.thickness);
}

void CaptureWidget::resizeEvent(QResizeEvent* e)
{
    QWidget::resizeEvent(e);
    m_context.widgetDimensions = rect();
    m_context.widgetOffset = mapToGlobal(QPoint(0, 0));
    if (!m_context.fullscreen) {
        m_panel->setFixedHeight(height());
        m_buttonHandler->updateScreenRegions(rect());
    }
}

void CaptureWidget::moveEvent(QMoveEvent* e)
{
    QWidget::moveEvent(e);
    m_context.widgetOffset = mapToGlobal(QPoint(0, 0));
}

void CaptureWidget::initContext(const QString& savePath, bool fullscreen)
{
    m_context.widgetDimensions = rect();
    m_context.color = m_config.drawColorValue();
    m_context.savePath = savePath;
    m_context.widgetOffset = mapToGlobal(QPoint(0, 0));
    m_context.mousePos = mapFromGlobal(QCursor::pos());
    m_context.thickness = m_config.drawThicknessValue();
    m_context.fullscreen = fullscreen;
}

void CaptureWidget::initPanel()
{
    QRect panelRect = rect();
    if (m_context.fullscreen) {
#if (defined(Q_OS_MACOS) || defined(Q_OS_LINUX))
        QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
        panelRect = currentScreen->geometry();
        auto devicePixelRatio = currentScreen->devicePixelRatio();
        panelRect.moveTo(panelRect.x() / devicePixelRatio,
                         panelRect.y() / devicePixelRatio);
#else
        panelRect = QGuiApplication::primaryScreen()->geometry();
        auto devicePixelRatio =
          QGuiApplication::primaryScreen()->devicePixelRatio();
        panelRect.moveTo(panelRect.x() / devicePixelRatio,
                         panelRect.y() / devicePixelRatio);
#endif
    }

    if (ConfigHandler().showSidePanelButtonValue()) {
        auto* panelToggleButton =
          new OrientablePushButton(tr("Tool Settings"), this);
        makeChild(panelToggleButton);
        panelToggleButton->setColor(m_uiColor);
        panelToggleButton->setOrientation(
          OrientablePushButton::VerticalBottomToTop);
#if defined(Q_OS_MACOS)
        panelToggleButton->move(0,
                                panelRect.y() + panelRect.height() / 2 -
                                  panelToggleButton->width() / 2);
#else
        panelToggleButton->move(panelRect.x(),
                                panelRect.y() + panelRect.height() / 2 -
                                  panelToggleButton->width() / 2);
#endif
        panelToggleButton->setCursor(Qt::ArrowCursor);
        (new DraggableWidgetMaker(this))->makeDraggable(panelToggleButton);
        connect(panelToggleButton,
                &QPushButton::clicked,
                this,
                &CaptureWidget::togglePanel);
    }

    m_panel = new UtilityPanel(this);
    m_panel->hide();
    makeChild(m_panel);
#if defined(Q_OS_MACOS)
    QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
    panelRect.moveTo(mapFromGlobal(panelRect.topLeft()));
    m_panel->setFixedWidth(m_colorPicker->width() * 1.5);
    m_panel->setFixedHeight(currentScreen->geometry().height());
#else
    panelRect.moveTo(mapFromGlobal(panelRect.topLeft()));
    panelRect.setWidth(m_colorPicker->width() * 1.5);
    m_panel->setGeometry(panelRect);
#endif

    SidePanelWidget* sidePanel = new SidePanelWidget(&m_context.screenshot);
    connect(sidePanel,
            &SidePanelWidget::colorChanged,
            this,
            &CaptureWidget::setDrawColor);
    connect(sidePanel,
            &SidePanelWidget::thicknessChanged,
            this,
            &CaptureWidget::setDrawThickness);
    connect(this,
            &CaptureWidget::colorChanged,
            sidePanel,
            &SidePanelWidget::updateColor);
    connect(this,
            &CaptureWidget::thicknessChanged,
            sidePanel,
            &SidePanelWidget::updateThickness);
    connect(
      sidePanel, &SidePanelWidget::togglePanel, m_panel, &UtilityPanel::toggle);
    sidePanel->colorChanged(m_context.color);
    sidePanel->thicknessChanged(m_context.thickness);
    m_panel->pushWidget(sidePanel);
    m_panel->pushWidget(new QUndoView(&m_undoStack, this));
}

void CaptureWidget::showAppUpdateNotification(const QString& appLatestVersion,
                                              const QString& appLatestUrl)
{
    if (!ConfigHandler().checkForUpdates()) {
        // option check for updates disabled
        return;
    }
    if (nullptr == m_updateNotificationWidget) {
        m_updateNotificationWidget =
          new UpdateNotificationWidget(this, appLatestVersion, appLatestUrl);
    }
#if defined(Q_OS_MACOS)
    int ax = (width() - m_updateNotificationWidget->width()) / 2;
#elif (defined(Q_OS_LINUX) && QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
    QRect helpRect = QGuiApplication::primaryScreen()->geometry();
    int ax = helpRect.left() +
             ((helpRect.width() - m_updateNotificationWidget->width()) / 2);
#else
    QRect helpRect;
    QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
    if (currentScreen) {
        helpRect = currentScreen->geometry();
    } else {
        helpRect = QGuiApplication::primaryScreen()->geometry();
    }
    int ax = helpRect.left() +
             ((helpRect.width() - m_updateNotificationWidget->width()) / 2);
#endif
    m_updateNotificationWidget->move(ax, 0);
    makeChild(m_updateNotificationWidget);
    m_updateNotificationWidget->show();
}

void CaptureWidget::initSelection()
{
    m_selection = new SelectionWidget(m_uiColor, this);
    connect(m_selection, &SelectionWidget::animationEnded, this, [this]() {
        this->m_buttonHandler->updatePosition(this->m_selection->geometry());
    });
    m_selection->setVisible(false);
    m_selection->setGeometry(QRect());
}

void CaptureWidget::setState(CaptureToolButton* b)
{
    if (!b) {
        return;
    }
    if (m_toolWidget) {
        m_toolWidget->deleteLater();
        if (m_activeTool != nullptr) {
            if (m_activeTool->isValid()) {
                pushToolToStack();
            }
        }
    }
    if (m_activeButton != b) {
        processTool(b->tool());
    }
    // Only close activated from button
    if (b->tool()->closeOnButtonPressed()) {
        close();
    }

    if (b->tool()->isSelectable()) {
        if (m_activeButton != b) {
            QWidget* confW = b->tool()->configurationWidget();
            m_panel->addToolWidget(confW);
            if (m_activeButton) {
                m_activeButton->setColor(m_uiColor);
            }
            m_activeButton = b;
            m_activeButton->setColor(m_contrastUiColor);
        } else if (m_activeButton) {
            m_panel->clearToolWidget();
            m_activeButton->setColor(m_uiColor);
            m_activeButton = nullptr;
        }
        updateCursor();
        update(); // clear mouse preview
    }
}

void CaptureWidget::processTool(CaptureTool* t)
{
    auto backup = m_activeTool;
    // The tool is active during the pressed().
    m_activeTool = t;
    t->pressed(m_context);
    m_activeTool = backup;
}

void CaptureWidget::handleButtonSignal(CaptureTool::Request r)
{
    switch (r) {
        case CaptureTool::REQ_CLEAR_MODIFICATIONS:
            m_undoStack.setIndex(0);
            update();
            break;

        case CaptureTool::REQ_INCREMENT_CIRCLE_COUNT:
            incrementCircleCount();
            break;

        case CaptureTool::REQ_DECREMENT_CIRCLE_COUNT:
            decrementCircleCount();
            break;

        case CaptureTool::REQ_CLOSE_GUI:
            close();
            break;
        case CaptureTool::REQ_HIDE_GUI:
            hide();
            break;
        case CaptureTool::REQ_HIDE_SELECTION:
            m_newSelection = true;
            m_selection->setVisible(false);
            updateCursor();
            break;
        case CaptureTool::REQ_SELECT_ALL:
            m_selection->setGeometryAnimated(rect());
            break;
        case CaptureTool::REQ_UNDO_MODIFICATION:
            m_undoStack.undo();
            break;
        case CaptureTool::REQ_REDO_MODIFICATION:
            m_undoStack.redo();
            break;
        case CaptureTool::REQ_REDRAW:
            update();
            break;
        case CaptureTool::REQ_TOGGLE_SIDEBAR:
            m_panel->toggle();
            break;
        case CaptureTool::REQ_SHOW_COLOR_PICKER:
            // TODO
            break;
        case CaptureTool::REQ_MOVE_MODE:
            setState(m_activeButton); // Disable the actual button
            break;
        case CaptureTool::REQ_CAPTURE_DONE_OK:
            m_captureDone = true;
            break;
        case CaptureTool::REQ_ADD_CHILD_WIDGET:
            if (!m_activeTool) {
                break;
            }
            if (m_toolWidget) {
                m_toolWidget->deleteLater();
            }
            m_toolWidget = m_activeTool->widget();
            if (m_toolWidget) {
                makeChild(m_toolWidget);
                m_toolWidget->move(m_context.mousePos);
                m_toolWidget->show();
                m_toolWidget->setFocus();
            }
            break;
        case CaptureTool::REQ_ADD_CHILD_WINDOW:
            if (!m_activeTool) {
                break;
            } else {
                QWidget* w = m_activeTool->widget();
                connect(
                  this, &CaptureWidget::destroyed, w, &QWidget::deleteLater);
                w->show();
            }
            break;
        case CaptureTool::REQ_ADD_EXTERNAL_WIDGETS:
            if (!m_activeTool) {
                break;
            } else {
                QWidget* w = m_activeTool->widget();
                w->setAttribute(Qt::WA_DeleteOnClose);
                w->show();
            }
            break;
        case CaptureTool::REQ_INCREASE_TOOL_SIZE:

            // increase thickness
            m_context.thickness = qBound(0, m_context.thickness + 1, 100);

            // show notifier circle
            m_notifierBox->showMessage(QString::number(m_context.thickness));

            emit thicknessChanged(m_context.thickness);
            break;
        case CaptureTool::REQ_DECREASE_TOOL_SIZE:

            // decrease thickness
            m_context.thickness = qBound(0, m_context.thickness - 1, 100);

            // show notifier circle
            m_notifierBox->showMessage(QString::number(m_context.thickness));

            emit thicknessChanged(m_context.thickness);
            break;
        default:
            break;
    }
}

void CaptureWidget::setDrawColor(const QColor& c)
{
    m_context.color = c;
    if (m_context.color.isValid()) {
        ConfigHandler().setDrawColor(m_context.color);
        emit colorChanged(c);
    }
}

void CaptureWidget::incrementCircleCount()
{
    m_context.circleCount++;
    SPDLOG_DEBUG("Incrementing Circle to {}.", m_context.circleCount);
}

void CaptureWidget::decrementCircleCount()
{

    SPDLOG_DEBUG("Decrementing Circle.");
    m_context.circleCount--;
}

void CaptureWidget::setDrawThickness(const int& t)
{
    m_context.thickness = qBound(0, t, 100);
    ConfigHandler().setDrawThickness(m_context.thickness);
    emit thicknessChanged(m_context.thickness);
}

void CaptureWidget::repositionSelection(QRect r)
{
    if (m_selection->isVisible()) {
        m_selection->setGeometry(r);
        QRect newGeometry = m_selection->geometry().intersected(rect());
        m_context.selection = extendedRect(&newGeometry);
        m_buttonHandler->updatePosition(m_selection->geometry());
        updateSizeIndicator();
        update();
    }
}

void CaptureWidget::adjustSelection(QMargins m)
{
    QRect newGeometry = m_selection->geometry() + m;
    if (rect().contains(newGeometry)) {
        repositionSelection(newGeometry);
    }
}

void CaptureWidget::resizeLeft()
{
    adjustSelection(QMargins(0, 0, -1, 0));
}

void CaptureWidget::resizeRight()
{
    adjustSelection(QMargins(0, 0, 1, 0));
}

void CaptureWidget::resizeUp()
{
    adjustSelection(QMargins(0, 0, 0, -1));
}

void CaptureWidget::resizeDown()
{
    adjustSelection(QMargins(0, 0, 0, 1));
}

void CaptureWidget::selectAll()
{
    QRect newGeometry = rect();
    m_selection->setGeometry(newGeometry);
    m_context.selection = extendedRect(&newGeometry);
    m_selection->setVisible(true);
    m_showInitialMsg = false;
    m_buttonHandler->updatePosition(m_selection->geometry());
    updateSizeIndicator();
    m_buttonHandler->show();
    update();
}

void CaptureWidget::initShortcuts()
{
    QString shortcut = ConfigHandler().shortcut(
      QVariant::fromValue(CaptureToolButton::ButtonType::TYPE_EXIT).toString());
    new QShortcut(QKeySequence(shortcut), this, SLOT(close()));

    shortcut = ConfigHandler().shortcut(
      QVariant::fromValue(CaptureToolButton::ButtonType::TYPE_SAVE).toString());
    new QShortcut(QKeySequence(shortcut), this, SLOT(saveScreenshot()));

    shortcut = ConfigHandler().shortcut(
      QVariant::fromValue(CaptureToolButton::ButtonType::TYPE_COPY).toString());
    new QShortcut(QKeySequence(shortcut), this, SLOT(copyScreenshot()));

    shortcut = ConfigHandler().shortcut(
      QVariant::fromValue(CaptureToolButton::ButtonType::TYPE_UNDO).toString());
    new QShortcut(QKeySequence(shortcut), this, SLOT(undo()));

    shortcut = ConfigHandler().shortcut(
      QVariant::fromValue(CaptureToolButton::ButtonType::TYPE_REDO).toString());
    new QShortcut(QKeySequence(shortcut), this, SLOT(redo()));

    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_TOGGLE_PANEL")),
                  this,
                  SLOT(togglePanel()));

    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_RESIZE_LEFT")),
                  this,
                  SLOT(resizeLeft()));
    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_RESIZE_RIGHT")),
                  this,
                  SLOT(resizeRight()));
    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_RESIZE_UP")),
                  this,
                  SLOT(resizeUp()));
    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_RESIZE_DOWN")),
                  this,
                  SLOT(resizeDown()));

    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_MOVE_LEFT")),
                  this,
                  SLOT(moveLeft()));
    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_MOVE_RIGHT")),
                  this,
                  SLOT(moveRight()));
    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_MOVE_UP")),
                  this,
                  SLOT(moveUp()));
    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_MOVE_DOWN")),
                  this,
                  SLOT(moveDown()));

    new QShortcut(
      QKeySequence(ConfigHandler().shortcut("TYPE_COMMIT_CURRENT_TOOL")),
      this,
      SLOT(commitCurrentTool()));

    new QShortcut(QKeySequence(ConfigHandler().shortcut("TYPE_SELECT_ALL")),
                  this,
                  SLOT(selectAll()));

    new QShortcut(Qt::Key_Escape, this, SLOT(deleteToolwidgetOrClose()));
}

void CaptureWidget::updateSizeIndicator()
{
    if (m_sizeIndButton) {
        const QRect& selection = extendedSelection();
        m_sizeIndButton->setText(QStringLiteral("%1\n%2")
                                   .arg(selection.width())
                                   .arg(selection.height()));
    }
}

void CaptureWidget::updateCursor()
{
    if (m_rightClick) {
        setCursor(Qt::ArrowCursor);
    } else if (m_grabbing) {
        setCursor(Qt::ClosedHandCursor);
    } else if (!m_activeButton) {
        using sw = SelectionWidget;
        if (m_mouseOverHandle != sw::NO_SIDE) {
            // cursor on the handlers
            switch (m_mouseOverHandle) {
                case sw::TOPLEFT_SIDE:
                case sw::BOTTOMRIGHT_SIDE:
                    setCursor(Qt::SizeFDiagCursor);
                    break;
                case sw::TOPRIGHT_SIDE:
                case sw::BOTTOMLEFT_SIDE:
                    setCursor(Qt::SizeBDiagCursor);
                    break;
                case sw::LEFT_SIDE:
                case sw::RIGHT_SIDE:
                    setCursor(Qt::SizeHorCursor);
                    break;
                case sw::TOP_SIDE:
                case sw::BOTTOM_SIDE:
                    setCursor(Qt::SizeVerCursor);
                    break;
                default:
                    break;
            }
        } else if (m_selection->isVisible() &&
                   m_selection->geometry().contains(m_context.mousePos)) {
            setCursor(Qt::OpenHandCursor);
        } else {
            setCursor(Qt::CrossCursor);
        }
    } else {
        setCursor(Qt::CrossCursor);
    }
}

void CaptureWidget::pushToolToStack()
{
    auto mod = new ModificationCommand(&m_context.screenshot, m_activeTool);
    disconnect(this,
               &CaptureWidget::colorChanged,
               m_activeTool,
               &CaptureTool::colorChanged);
    disconnect(this,
               &CaptureWidget::thicknessChanged,
               m_activeTool,
               &CaptureTool::thicknessChanged);
    if (m_panel->toolWidget()) {
        disconnect(m_panel->toolWidget(), nullptr, m_activeTool, nullptr);
    }
    m_undoStack.push(mod);
    m_activeTool = nullptr;
}

void CaptureWidget::makeChild(QWidget* w)
{
    w->setParent(this);
    w->installEventFilter(m_eventFilter);
}

void CaptureWidget::togglePanel()
{
    m_panel->toggle();
}

void CaptureWidget::childEnter()
{
    m_previewEnabled = false;
    update();
}

void CaptureWidget::childLeave()
{
    m_previewEnabled = true;
    update();
}

void CaptureWidget::copyScreenshot()
{
    m_captureDone = true;
    if (m_activeTool != nullptr) {
        QPainter painter(&m_context.screenshot);
        m_activeTool->process(painter, m_context.screenshot, true);
    }

    ScreenshotSaver().saveToClipboard(pixmap());
    close();
}

void CaptureWidget::saveScreenshot()
{
#if defined(Q_OS_MACOS)
    showNormal();
#endif
    m_captureDone = true;
    if (m_activeTool != nullptr) {
        QPainter painter(&m_context.screenshot);
        m_activeTool->process(painter, m_context.screenshot, true);
    }
    hide();
    if (m_context.savePath.isEmpty()) {
        ScreenshotSaver(m_id).saveToFilesystemGUI(pixmap());
    } else {
        ScreenshotSaver(m_id).saveToFilesystem(
          pixmap(), m_context.savePath, "");
    }
    close();
}

void CaptureWidget::undo()
{
    m_undoStack.undo();
}

void CaptureWidget::redo()
{
    m_undoStack.redo();
}

QRect CaptureWidget::extendedSelection() const
{
    if (!m_selection->isVisible())
        return QRect();
    QRect r = m_selection->geometry();
    return extendedRect(&r);
}

QRect CaptureWidget::extendedRect(QRect* r) const
{
    auto devicePixelRatio = m_context.screenshot.devicePixelRatio();
    return QRect(r->left() * devicePixelRatio,
                 r->top() * devicePixelRatio,
                 r->width() * devicePixelRatio,
                 r->height() * devicePixelRatio);
}
